“Joseph would not have remained so undisturbed, hearing from the angel the word “Virgin”, had he not already heard the same word from Isaiah. For a man who had meditated at length on the words of the prophet, the miracle of a Virgin Mother ceased to seem novel and became something familiar.”John Chrysostom, Homily on Matthew 5, 2; PG 57, 50.
Gambero, L., 1999. Mary and the Fathers of the Church 1st ed. Translated by Buffer, T., San Francisco: Ignatius Press.